If Europe wants to add Ukraine to NATO then I think the USA should begin exiting from the alliance.

And this is why. Continued eastern expansion to the borders of Russia along with potentially providing these neighbors with nukes is irresponsibly provocative. I was in 5th grade in November of 1962. Growing up in Stamford, Connecticut, 35 miles from downtown NYC and surrounded by multiple defense contractors, we were all well aware we were going to be vaporized first if war began. Kenenedy risked WWIII to get the missiles out of Cuba. But many forget they were put there by Russia in response to American nukes placed in Turkey. Yes, Krushchev removed his from Cuba. But we also dismantled the Jupiter missiles in Turkey. Removing the provocation in each other's back yard.

Actions that were viewed as nearly an act of war in 1962 have not become benign in the subsequent decades. If Europe wants to pursue this folly, they should do so without us.